At Kate Middleton's wedding in 2011, it was her younger sister Pippa who was the unlikely star of the show.

And yesterday at Pippa’s wedding to James Matthews it was HIS younger sibling that set tongues wagging.

British reality TV fans know all too well that Spencer Matthews is more like a pantomime villain than a man to be lusted over.

But across the pond, they knew nothing about Made In Chelsea's bad boy lothario, and Page Six reported: "Meet Pippa’s hot brother-in-law."

Spencer Matthews had a great time at his brother's wedding (Image: Rex Features)

He played an important part in Pippa Middleton's wedding to James Matthews (Image: WireImage)

And he certainly appeared to be an eligible bachelor as he is estimated to be worth £2.9 million.

But despite his fortune, Spencer has made quite a name for himself as a love rat on E4's Made in Chelsea.

His love life and on-and-off relationships tended to be the main focus of his storylines and made great telly. Throughout the series he dated several cast members, earning him a reputation as a lothario.

And British fans were surprised to see the reality TV star at the society do.

American royal fans can't get enough of Spencer (Image: WireImage)

But he seems to have settled down for now as he met his girlfriend the beautiful Vogue Williams , 31, when they both appeared on The Jump 2017 earlier this year.

The Irish born model was first linked to Spencer when they both signed up for Channel 4 winter sports show and were seen looking cosy in several social media snaps from the slopes.

But she didn't attend the family wedding on Saturday.

Meeting William and Harry outside the church (Image: AFP)

Instead, Spencer performed his best man duties without a plus one and looked thrilled as he chatted to Princes William and Harry outside the church wedding on Saturday morning.

He was snapped greeting the royal brothers at St. Mark's Church in Englefield with a huge smile on his face, before giving a salute to fellow guests.

William and Harry both arrived without partners Kate Middleton and Meghan Markle .

Kate was elsewhere helping get the pageboys and bridesmaids ready, while American actress Meghan was believed to have attended the reception, rather than church.

Giving a salute to guests (Image: PA)

Meanwhile, Spencer's girlfriend Vogue Williams , was working in Dublin on Saturday.

Although it had already been widely reported that Spencer’s girlfriend Vogue, 31, would not be in attendance, many fans had been hoping for a last minute change of plan and to see her next to Spencer on the big day.

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Spencer Matthews has arrived! (Image: WireImage)

A rep for Vogue said last month the model, presenter and DJ had prior work commitments in response to unconfirmed claims Pippa had imposed a ‘no ring, no bring’ rule on guests, meaning anyone who was not engaged or married could not bring their other half.

"Vogue has a prior engagement in her diary on the date of the wedding, but wishes Pippa and James all the best on their special day,” said a spokesperson.

Vogue is in Dublin on a business trip (Image: Andrew Porter)

An unconfirmed source told The Sun in April: "Pippa’s view is that it wouldn’t be appropriate for her to be there after a few months of dating. But some are shocked because her future brother-in-law will end up attending on his own."

But a friend of Vogue's hit back by saying: "She is working on the wedding day. It’s a job that has been booked in for ages."

Spencer looked dapper as he joined guests at the small village church ahead of a lavish reception at the Middleton family home, where a £100,000 glass marquee has been constructed in the grounds.

It’s was widely reported but unconfirmed that Spencer was James’ best man, however sources claimed last week he'd been given some rules on what he could and couldn't say.

“Spencer has been given a last-minute warning to keep the speech clean," an insider told Daily Star .

"He isn’t allowed to give a traditional best man’s speech in case he shows anyone up in front of the royals."

Pippa is marrying Spencer's brother James (Image: WireImage)

The Chelsea star was looking tanned after spending the start of this month abroad with Vogue; the smitten pair had shared numerous selfies to social media showing them looking inseparable, which is what had many fans wondering if she may still attend the wedding.

Spencer and Vogue initially played coy on their romance, insisting they were just friends before Vogue teased in March that there could be a “little bit of truth” to the rumours.

They finally confirmed the relationship in April when Spencer boldly claimed on Instagram that his “girlfriend” was hotter than Cindy Crawford, alongside a smouldering photo of Vogue.

They are marrying at St. Mark's Church (Image: Rex Features)

Vogue recently denied claims it was all a showmance, Daily Mail : “I’ve never understood how people could have a showmance because it’s really hard to fake something like that. I wouldn’t be able to and I wouldn’t do it to my family either. It’s telling lies.

"Obviously Spencer has a reputation and people are waiting to catch him out."